Update .gitignore

Add additional commonly ignored files to .gitignore. The additional
entries were copied from what is already configured in
python-tripleoclient. Add these to .gitignore has the additional benefit
of these files also being ignored by ansible-lint, since ansible-lint
uses git ls-files.

Change-Id: Ibad5463c7e7c744f068609d62ccd4d3b0fd6eab0
Signed-off-by: James Slagle <jslagle@redhat.com>

.gitignore

@@ -34,11 +34,13 @@ lib64
 pip-log.txt
 
 # Unit test / coverage reports
-cover
 .coverage
 .tox
-.testrepository
 nosetests.xml
+.testrepository
+.stestr/*
+cover/*
+MagicMock/*
 
 # Translations
 *.mo
@@ -46,12 +48,18 @@ nosetests.xml
 *.bundle
 Gemfile.lock
 
-doc/_build
-
 # Built by pbr (python setup.py sdist):
 AUTHORS
 ChangeLog
 
+# Sphinx
+doc/build
+
+# Editors
+*~
+.*.swp
+.*sw?
+
 # Leftovers from other commants like tox -e pep8,tht
 .cache
 common/deploy-steps-tasks-step-0.yaml